Experiments with Snails, Moths, and Beetles 143 
Coutagne states that any one of the three kinds of larve, white, 
black, or zebra, may be associated with either of the two kinds 
of cocoons, yellow or white. This gives six combinations. Any 
of these six may be associated with either of the two kinds of 
moths, white or black, giving a total of twelve possible combi- 
nations. The following results were obtained : — 
(1) Crossing individuals with two different characters often 
gives offspring in the first generation that are intermediate in 
character. Thus the race Chang-hai has a white cocoon that is 
small and spherical, while the race Jaune Var has a rose-yellow 
cocoon that is large and ellipsoidal with a constriction. The 
cocoons of the hybrid have a pale yellow tint, about intermediate 
in color,’ the form also is intermediate — ellipsoidal, but less 
elongated, and the constriction absent or scarcely marked. 
(2) Crossing individuals of different races may give in the first 
gencration a /usion of two characters, but subsequent generations 
descended from the first show a mixture of the two characters 
in question. 
The statement is also illustrated by reference to cocoon-char- 
acters, but the line of separation of the colors does not appear 
very sharp. 7 
(3) When the crossing has given a /usion in the first generation, 
and in the second generation a mixture (“mélange hétérogéne’’), 
it is possible to produce a homogenous race, by means of selec- 
tion, that shows the characters that fused. In each successive 
generation the individuals presenting the united characters, 7.e. 
those ‘‘fondus,” must be selected. This statement Coutagne 
puts in the form of a question, because he has not, he says, 
indisputable facts in support of it. 
(4) Crossing individuals with different characters often gives 
a separation in equal parts of the two characters. For example, 
an individual of a race having white worms, white cocoons, and 
white moths was crossed with an individual of a race having 
1 Two to three per cent, however, were pure white, small, and spherical (type 
Chang-hai); and 4 to 5 per cent were yellow, nearly of the yellow type but less 
yellow. These Coutagne suggests were due to accidental mixing. 
